1. Department of Obstetrics and Gynaecology, Higher Institute of Medical Technology of Nkolondom, Yaounde, Cameroon
2. Obstetrics and Gynaecology Unit, Yaounde Central Hospital, Yaounde, Cameroon
3. Research, Education and Health Development Group “GARES-Falaise,” Dschang, Cameroon
4. Faculty of Medicine and Biomedical Sciences, The University of Yaounde I, Yaounde, Cameroon
5. Department of Obstetrics and Gynaecology, Mbouda District Hospital, Mbouda, Cameroon
6. Geneva University Hospitals, Geneva, Switzerland
7. Faculty of Health Sciences, School of Armies Health Services of Lomé, University of Lomé, Lomé, Togo